<template>

<el-container class="el_container">
    <!-- 头部区域 -->
  <el-header class="el_header">
      <div>
          <img src="../assets/heima.png" alt="黑马logo">
          <span>电商后台管理系统</span>
      </div>
         <el-button type="info" @click="logout">退出</el-button>
  </el-header>
  <!-- 页面主体区域 -->
  <el-container>
      <!-- 侧边栏菜单区域  -->
    <el-aside :width="isCollapsed ? '64px' : '200px'" class="el_aside">
      <div class="toggle-button" @click="toggleCollapse">|||</div>
       <el-menu
      class="el-menu-vertical-demo"
      @open="handleOpen"
      @close="handleClose"
      background-color="skyblue"
      text-color="black"
      active-text-color="#ffd04b"
      :unique-opened="true"
      :collapse="isCollapsed"
      :collapse-transition="false"
      :router="true"
      :default-active="activePath">
      <!-- 一级菜单 -->
      <el-submenu :index="item.id+''" v-for="item in menuList" :key="item.id">
        <!-- 一级菜单的模板区域 -->
        <template slot="title">
          <!-- 图标 -->
          <i :class="iconsObj[item.id]"></i>
          <!-- 文本 -->
          <span>{{item.authName}}</span>
        </template>        
        <!-- 二级菜单 -->
        <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children"
         :key="subItem.id" @click="saveNavState('/'+subItem.path)">
          <!-- 二级菜单的模板区域 -->
          <template slot="title">
          <!-- 图标 -->
          <i class="el-icon-menu"></i>
          <!-- 文本 -->
          <span>{{subItem.authName}}</span>
        </template>
        </el-menu-item>
      </el-submenu>
    </el-menu>
    </el-aside>
    <!-- 右侧主体内容 -->
    <el-main class="el_main">
      <!-- 路由占位符 -->
      <router-view></router-view>
    </el-main>
  </el-container>
</el-container>
</template>

<script>
export default {
  data(){
    return{
      //左侧菜单数据
      menuList:[],
      iconsObj:{
        '125':'iconfont icon-user',
        '103':'iconfont icon-tijikongjian',
        '101':'iconfont icon-shangpin',
        '102':'iconfont icon-danju',
        '145':'iconfont icon-baobiao',
      },
      //是否折叠
      isCollapsed:false,
      // 被激活链接的地址
      activePath:''
    }
  },
  created(){
    this.getMenuList(),
    this.activePath=window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      window.sessionStorage.clear()// 清空token值
      this.$router.push('/login')// 重定向回登录页面
    },
    // 获取所有菜单
    async getMenuList(){
      const{data:res}= await this.$http.get('menus')
      if(res.meta.status!== 200) return this.$message.error(res.meta.msg)
      this.menuList=res.data
      console.log(res)
    },
    //点击按钮，切换菜单的折叠与展开
    toggleCollapse(){
      this.isCollapsed= ! this.isCollapsed
    },
    // 保存链接的激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem("activePath", activePath)
      this.activePath=activePath
    }
  }
}
</script>

<style lang="less" scoped>
.el-header {
    background-color: pink;
    display:flex;
    justify-content: space-between;
    padding-left:0 ;
    align-items:center;
    color:#fff;
    font-size:20px;
    > div {
        display:flex;
        align-items: center;
        > span {
            padding-left: 10px;
        }
    }
}
.el_aside {
    background-color: skyblue;
    .el_menu {
      border-right: none;
    }
}
.el_main {
    background-color: #fff;
}
.el_container {
    height:100%;
}
.iconfont {
  margin-right: 10px;
}

.toggle-button {
  background-color: #4a5064;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2rem;
  cursor: pointer;
}
</style>
